You can just about get away with this when they are small seedlings but once they are established plants you need to retain the same soil level when you repot and not pile it on top - it is bad for the roots and may cause the stem to rot. Stake the stem if it is long and can't support the plants.Thanks man. Also not good to have a long ass stem tho thatll cause weak plants too which was my reason for burying the stem a little bit. They stretched early on.